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CHEMICAL CARTOGRAPHY with APOGEE: METALLICITY DISTRIBUTION FUNCTIONS and the CHEMICAL STRUCTURE of the MILKY WAY DISK

Hayden, MR, Holtzman, JA, Bovy, J, Nidever, DL, Bird, JC, Weinberg, DH, Johnson, JA, Andrews, BH, Majewski, SR, García Pé Rez, AE, Hearty, FR, O'Connell, R, Skrutskie, M, Wilson, JC, Prieto, CA, García-Herńandez, DA, Zamora, O, Anders, F, Chiappini, C, Minchev, I , Steinmetz, M, Beers, TC, Bizyaev, D, Pan, K, Girardi, L, Cunha, K, Smith, V, Frinchaboy, P, Harding, P, Schneider, DP, Mészáros, S, Robin, AC, Schiavon, RP, Schultheis, M, Shetrone, M and Zasowski, G (2015) CHEMICAL CARTOGRAPHY with APOGEE: METALLICITY DISTRIBUTION FUNCTIONS and the CHEMICAL STRUCTURE of the MILKY WAY DISK. Astrophysical Journal, 808 (2). pp. 1-18. ISSN 0004-637X

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Abstract

Using a sample of 69,919 red giants from the SDSS-III/APOGEE Data Release 12, we measure the distribution of stars in the [/Fe] versus [Fe/H] plane and the metallicity distribution functions (MDFs) across an unprecedented volume of the Milky Way disk, with radius 3 < R < 15 kpc and height kpc. Stars in the inner disk (R < 5 kpc) lie along a single track in [/Fe] versus [Fe/H], starting with -enhanced, metal-poor stars and ending at [/Fe] ∼ 0 and [Fe/H] ∼ +0.4. At larger radii we find two distinct sequences in [/Fe] versus [Fe/H] space, with a roughly solar- sequence that spans a decade in metallicity and a high- sequence that merges with the low- sequence at super-solar [Fe/H]. The location of the high- sequence is nearly constant across the disk.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical And Space Sciences, 0305 Organic Chemistry, 0306 Physical Chemistry (Incl. Structural)
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: American Astronomical Society
Date Deposited: 11 Jan 2016 10:30
Last Modified: 07 Sep 2017 13:02
DOI or Identification number: 10.1088/0004-637X/808/2/132
URI: http://researchonline.ljmu.ac.uk/id/eprint/2564

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